| Year | Value | | 2021 | 32.05416291 | | 2020 | 27.73001017 | | 2019 | 19.97827095 | | 2017 | 11.20919659 | | 2016 | 9.601538462 | | 2015 | 7.9 | | 2014 | 6.5 | | 2013 | 5.1 | | 2012 | 3.5 | | 2011 | 2 | | 2010 | 1.28 | | 2009 | 1.61 | | 2008 | 1.15 | | 2007 | 1.790559361 | | 2006 | 1.754487261 | | 2005 | 1.716190476 | | 2004 | 1.507912772 | | 2003 | 1.374404668 | | 2002 | 1.321656935 | | 2001 | 0.904103545 | | 2000 | 0.835249302 | | 1999 | 0.667113315 | | 1998 | 0.234958542 | | 1997 | 0.100588321 | | 1996 | 0.002067023 |
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